165740216 has 8 divisors (see below), whose sum is σ = 310762920. Its totient is φ = 82870104.

The previous prime is 165740213. The next prime is 165740243. The reversal of 165740216 is 612047561.

165740216 = 3211² + 3212² + ... + 3226².

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165740213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10358756 + ... + 10358771.

It is an arithmetic number, because the mean of its divisors is an integer number (38845365).

Almost surely, 2^165740216 is an apocalyptic number.

It is an amenable number.

165740216 is a deficient number, since it is larger than the sum of its proper divisors (145022704).

165740216 is a wasteful number, since it uses less digits than its factorization.

165740216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20717533 (or 20717529 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 165740216 is about 12874.0132049023. The cubic root of 165740216 is about 549.2996220057.

Adding to 165740216 its reverse (612047561), we get a palindrome (777787777).

The spelling of 165740216 in words is "one hundred sixty-five million, seven hundred forty thousand, two hundred sixteen".